caja-directory.c: Fix memory leak.

When creating a new file (using a template, for instance), file->
details->is_added could potentially be FALSE, and cause this file to
not be finalized along with other files if the view directory is
destroyed.

This can cause issues when re-entering that directory, with the file
being in an undefined state, and could prevent the view from fully
loading the location (this is identical behavior to that described
in https://github.com/mate-desktop/python-caja/pull/64.

To reproduce:
- Create an svg file and save in ~/Templates.
- Right-click, Create document-> svg file, name it whatever.
- Navigate out of the folder.
- Modify the file in a visible manner.
- Re-enter the folder, note that it never finishes loading.

Ref:
https://github.com/linuxmint/nemo/issues/2736

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